Photochemically produced copolymers



Patented Sept. 28, 1954 PHOTOCHEMICALLY PRODUCED COPOLYMERS Wilhelm Moschel and Wilhelm Miiller, Leverkusen, Germany, assignors to Farbenfabriken Bayer Aktiengesellschaft, Leverkusen, Germany, a corporation of Germany UNITED STATES PATENT OFFICE No Drawing. Application August '7, 1951, Serial No. 240,784

Claims priority, application Germany August 26, 1950 2 Claims. (Cl. 204-158) halides etc. with double bonds.

manufacture of plastics.

2 1-2 hours. After 36 hours the volume of the viscous liquid has been concentrated to about of the previous volume. An oil is thus obtained which solidifies at room temperature in the irradiation with light, preferably from an ultra- 5 form of a grease. The product is charred only at violet light source. The polymers and copolymers temperatures from 250 C. thus obtained are hydrocarbons, hydrocarbon We claim:

1. A copolymeric product of the irradiation In accordance with the present invention, a reaction with the light of wave length in the novel copolymer is one containing trifluoro chlorange of 2,200 to 6,000 Angstrom units of from roethene and a silicic acid ester. This copoly- 50 to 80 per cent by volume of trifluorochlorethmer may be obtained by exposing a mixture conene and from 50 to 20 per cent by volume of an taining trifiuoro chloroethene and a silicic acid ortho silicic acid ester. ester to irradiation with light, preferably of 2. A copolymeric product of the irradiation reve lengths in the range o 2200 t 6 A action with the light of wave length in the range strom Units. Alkyl as well as aryl esters of the of 2,200 to 6,000 Angstrom units of 80 per cent by silicic acid come into consideration as, for inl me of trifl r hloroethen nd per cent, Stance, yl. ethy p opy ty p p by volume of ethyl ortho silicate, said product yL y p y y y p t y being a greasy material at room temperatures sil cates. M tu s f q l p s y v u f 20 and charring at temperatures of about 250 0. an organic silicate and trifluoro chloroethene can d higher be copolymerized but also mixtures containing one of the reactants in surplus. It is preferred to References Cited in the file of this patent copolymerize mixtures containing a greater quan- UNITED STATES PATENTS tity by volume of the trifluoro chloroethene than of the silicic acid ester. The products obtained Number Name Date according to the invention are uniform com- 33 3x 3 2: g:* pounds which are useful as mteimedlates for the 2,392,378 Hanford Jan. 8 1946 The invention is further illustrated by the fol- 2407'181 Scotti Sept- 31 1946 2,420,222 Benmng et al May 6, 1947 lowing example wlthout bemg restricted t e 2,433,844 Hanford Jan- 6, 1948 Example 2,456,255 Coffman et a1 Dec. 14, 1948 A liquid mixture containing 80% by volume of 2,471,959 Hunt May 1949 trifluoro chloroethene and 20% by volume of 35 2,478,390 Henferd Aug-9,1949 ethyl silicate is exposed to irradiation with ultra- 2,564,024 Miller 14, 1951 2,569,524 Hamilton Oct. 2, 1951 violet light. The liquid becomes viscous after 

1. A COPOLYMERIC PRODUCT OF THE IRRADIATION REACTION WITH THE LIGHT OF WAVE LENGTH IN THE RANGE OF 2,200 TO 6,000 ANGSTROM UNITS OF FROM 50 TO 80 PER CENT BY VOLUME OF TRIFLUOROCHLORETHENE AND FROM 50 TO 20 PER CENT BY VOLUME OF AN ORTHO SILICA ACID ESTER. 